Lionel Rogg (b. Geneva, April 21 1936) is a Swiss organist, composer and teacher of musical theory. Among many other distinctions, he has recorded the complete organ works of Johann Sebastian Bach three times.

Rogg showed exceptional musical gifts at an early age. At 15 he took charge of the Geneva St Boniface organ, and later, at the Conservatory of Geneva, he studied under Pierre Segond (a pupil of Marcel Dupré). He obtained degrees in harmony, counterpoint and fugue, and won scholarships, organ and piano prizes, and a First Prize for sight-reading. In 1959 he won second prize for organ at the International Music Competition of Munich. He also studied with Nikita Magaloff.

After three years of intensive study, in 1961 he gave a series of ten recitals of the complete organ works of J S Bach at the Victoria Hall, Geneva. These recitals were very enthusiastically received, and were followed by organ recitals in France, Spain, Belgium, Holland, Switzerland, and in England at St Albans and at the Royal Festival Hall in London. He gave two recitals devoted to Bach's 'Orgelbüchlein' at the 1962 International Festival of Montreux, and participated in Festivals and organ weeks at Bayreuth and Nuremberg.

Soon after his Geneva recitals, Rogg was invited to record the complete organ works of Bach on the new mechanical-action, electro-pneumatic registration 67-stop organ built in the Zurich Grossmunster built by Metzler & Sohne Orgelbau (Dietikon ZH), 1958-1960. This programme was begun in September 1961 and completed in September 1964, in ten sessions of three evenings each. The recording was made by the technical service of Radio Zurich using three microphones, two for the Positifs and one for the Great and Pedals, but were processed and mastered in England for Oryx Records. The resulting recordings were issued on the Bach Recordings label.

Rogg also recorded the complete Bach organ works for Harmonia Mundi, first released in 1970 and re-released on CD in 1992 and 2000, on the Silbermann organ in Arlesheim. This instrument was built by Johann Andreas, son of Andreas Silbermann, in 1761, and restored by Metzler in 1959-1962.

In addition to organ recitals, Rogg composed music, played the harpsichord and made recordings with chamber groups. He made organ, harpsichord and piano recordings for the Swiss Broadcasting Company, including a performance of the 6 Trio Sonatas played on his own Wittmayer pedal-harpsichord. Lionel Rogg wrote a Manual on Counterpoint, and was Professor of Counterpoint and Fugue at the Geneva Conservatory.

Rogg's 1969 recording of J S Bach's Die Kunst der Fuge, BWV 1080, issued on HMV CSD 3666-3667, includes a form of the Contrapunctus XVIII with Rogg's own conjectural completion, in addition to the performance of the original (incomplete) Fugue. This performance was given on the organ of St Peter's Cathedral, Geneva.

Lionel Rogg continues to be fully active in recitals, master-classes, adjudication, and the many branches of his work, in Europe and beyond.

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